The invention provides an incoming call reminding platform, an incoming call reminding method and an internet protocol (IP) multimedia subsystem. The incoming call reminding platform is arranged in the IP multimedia subsystem (IMS), and comprises a first receiving module, a subscribing module, a second receiving module and a first notification module, wherein, the first receiving module is used for receiving a reminding request; the subscribing module is used for sending the subscribing request for subscribing the status of a called terminal to a present platform; the second receiving module is used for receiving the status information of the called terminal sent by the present platform according to the subscribing request; and the first notification module is used for sending the relevant calling information to the called terminal when the status information of the called terminal sent by the present platform indicates that the called terminal communication can be achieved. The invention provides a communication channel that an IMS called user acquires the information of a missed call, and the method has high reliability and is easy and convenient to realize.